103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
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//===- Interpreter.cpp - Top-Level LLVM Interpreter Implementation --------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the top-level functionality for the LLVM interpreter.
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// This interpreter is designed to be a very simple, portable, inefficient
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// interpreter.
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//
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//===----------------------------------------------------------------------===//
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#include "Interpreter.h"
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#include "llvm/CodeGen/IntrinsicLowering.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Module.h"
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#include <cstring>
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using namespace llvm;
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namespace {
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static struct RegisterInterp {
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RegisterInterp() { Interpreter::Register(); }
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} InterpRegistrator;
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}
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extern "C" void LLVMLinkInInterpreter() { }
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/// Create a new interpreter object.
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///
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ExecutionEngine *Interpreter::create(std::unique_ptr<Module> M,
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std::string *ErrStr) {
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// Tell this Module to materialize everything and release the GVMaterializer.
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if (Error Err = M->materializeAll()) {
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std::string Msg;
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handleAllErrors(std::move(Err), [&](ErrorInfoBase &EIB) {
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Msg = EIB.message();
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});
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if (ErrStr)
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*ErrStr = Msg;
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// We got an error, just return 0
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return nullptr;
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}
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return new Interpreter(std::move(M));
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}
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//===----------------------------------------------------------------------===//
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// Interpreter ctor - Initialize stuff
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//
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Interpreter::Interpreter(std::unique_ptr<Module> M)
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: ExecutionEngine(std::move(M)) {
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memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
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// Initialize the "backend"
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initializeExecutionEngine();
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initializeExternalFunctions();
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emitGlobals();
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IL = new IntrinsicLowering(getDataLayout());
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}
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Interpreter::~Interpreter() {
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delete IL;
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}
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void Interpreter::runAtExitHandlers () {
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while (!AtExitHandlers.empty()) {
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callFunction(AtExitHandlers.back(), None);
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AtExitHandlers.pop_back();
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run();
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}
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}
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/// run - Start execution with the specified function and arguments.
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///
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GenericValue Interpreter::runFunction(Function *F,
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ArrayRef<GenericValue> ArgValues) {
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assert (F && "Function *F was null at entry to run()");
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// Try extra hard not to pass extra args to a function that isn't
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// expecting them. C programmers frequently bend the rules and
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// declare main() with fewer parameters than it actually gets
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// passed, and the interpreter barfs if you pass a function more
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// parameters than it is declared to take. This does not attempt to
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// take into account gratuitous differences in declared types,
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// though.
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const size_t ArgCount = F->getFunctionType()->getNumParams();
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ArrayRef<GenericValue> ActualArgs =
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ArgValues.slice(0, std::min(ArgValues.size(), ArgCount));
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// Set up the function call.
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callFunction(F, ActualArgs);
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// Start executing the function.
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run();
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return ExitValue;
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}
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